Xbox one x/PS4 . Trouble shooting via photo 2. You have a good amount of money and a population of over 100k. You know how to play. A lone Postal van appears to be coming out of the right side of the hub and your temp is set for C not F. Is you city set up for driving on left left side of the road? If so switch the direction of the one way road. That should help.
Suggestion. When I set up a train hub I do so on a dirt road. I make a T connection with a regular two way road going in at the arrow for incoming traffic, then delete the dirt road. I end with a section a asymmetrical road so traffic can go left or right. This makes for a smoother running hub. Ends up looking like a driveway. It can be long to hold in coming traffic. This is also helpful for bus, trams or any service that produces tons of traffic like a Postal hub. And you can squeeze a driveway in between buildings to add access in tight spaces. I hope this helps.